Ive decoded and burn many movies - never had this problem b4

I converted a divx widescreen movie to mpg with tmpgenc - it encoded with no problem- cut it - no problems
burnt it using nero as always - no problem.
Burnt it to disk and then when I play it back in my player in occupies only the top left corner of the screen and is really small.

It has to do with the aspect ratio but im not sure where im going wrong.

Any help would be apreciated
Thx in advance